>> holman: on the political checklist, david chalian talks to gwen and judy about sarah palin in iowa and president obama's town hall meeting today. watch the video on our new politics page. on patchwork nation, we look at congressional districts this midterm election season. midterm election season. tonight find a map tracking foreclosures nationwide plus analysis of how housing troubles may affect voters in november. plus, now that the b.p. oil well is officially sealed, we turn to the brewing environmental and legal fights. we round up a list of issues to watch on the rundown. all that and more is on our web site, newshour.pbs.org. >> ifill: and that's the newshour for tonight. on tuesday, we'll look at tennessee's plan to reward teachers when students perform well. i'm gwen ifill. >> brown: and i'm jeffrey brown. we'll see you online and again here tomorrow evening. thank you, and good night. major funding for the pbs newshour has been provided by: and with the ongoing support of these institutions and foundations. and... this program was made possible by the corporation for publi